If p+ 1/p =3, the value of p- 1/p is :
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(p-1/p)^2=(p+1/p)^2-4
(p-1/p)^2=3^2-4
(p-1/p)^2=5
p-1/p= +-root5
(p-1/p)^2=3^2-4
(p-1/p)^2=5
p-1/p= +-root5
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